Emry, Lurker of the Loch, Intruder Alarm, and Chamber Sentry

Prerequisites

• Emry, Lurker of the Loch on the battlefield
• Intruder Alarm on the battlefield
• Chamber Sentry in the graveyard
• Emry does not have summoning sickness

Steps

1. Activate Emry by tapping it, allowing you to cast Chamber Sentry from your graveyard this turn
2. Cast Chamber Sentry by paying
3. Chamber Sentry enters the battlefield and dies as a state-based action due to having zero toughness
4. Intruder Alarm triggers, untapping all creatures
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite storm count
• Infinite untap of all creatures